Efficient manipulation of terahertz waves by multi-bit coding metasurfaces and further applications of such metasurfaces

doi:10.1088/1674-1056/abd6fc

中国物理B ›› 2021, Vol. 30 ›› Issue (2): 24211-0.doi: 10.1088/1674-1056/abd6fc

收稿日期:2020-10-16 修回日期:2020-12-17 接受日期:2020-12-28 出版日期:2021-01-18 发布日期:2021-01-29

Efficient manipulation of terahertz waves by multi-bit coding metasurfaces and further applications of such metasurfaces

Yunping Qi(祁云平)^1,† Baohe Zhang(张宝和)¹, Jinghui Ding(丁京徽)¹, Ting Zhang(张婷)¹, Xiangxian Wang(王向贤)², and Zao Yi(易早)³

1 College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China; 2 School of Science, Lanzhou University of Technology, Lanzhou 730050, China; 3 Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621900, China

Received:2020-10-16 Revised:2020-12-17 Accepted:2020-12-28 Online:2021-01-18 Published:2021-01-29
Contact: ^†Corresponding author. E-mail: qiyunping@nwnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 61865008), Northwest Normal University Young Teachers' Scientific Research Capability Upgrading Program (Grant No. NWNU-LKQN2020-11), and the Scientific Research Fund of Sichuan Provincial Science and Technology Department, China (Grant No. 2020YJ0137).

摘要/Abstract

Abstract: Benefiting from the unprecedented superiority of coding metasurfaces at manipulating electromagnetic waves in the microwave band, in this paper, we use the Pancharatnam-Berry (PB) phase concept to propose a high-efficiency reflective-type coding metasurface that can arbitrarily manipulate the scattering pattern of terahertz waves and implement many novel functionalities. By optimizing the coding sequences, we demonstrate that the designed 1-, 2-, and 3-bit coding metasurfaces with specific coding sequences have the strong ability to control reflected terahertz waves. The two proposed 1-bit coding metasurfaces demonstrate that the reflected terahertz beam can be redirected and arbitrarily controlled. For normally incident x-and y-polarized waves, a 10 dB radar cross-section (RCS) reduction can be achieved from 2.1 THz to 5.2 THz using the designed 2-bit coding metasurface. Moreover, two kinds of orbital angular momentum (OAM) vortex beams with different moduli are generated by a coding metasurface using different coding sequences. Our research provides a new degree of freedom for the sophisticated manipulation of terahertz waves, and contributes to the development of metasurfaces towards practical applications.

Key words: coding metasurface, Pancharatnam-Berry phase, multiple beams, radar cross-section (RCS) reduction, orbital angular momentum

中图分类号: (Scattering, polarization)

42.68.Mj

81.05.Xj (Metamaterials for chiral, bianisotropic and other complex media) 42.25.Ja (Polarization) 78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials)

. [J]. 中国物理B, 2021, 30(2): 24211-0.

Yunping Qi(祁云平) Baohe Zhang(张宝和), Jinghui Ding(丁京徽), Ting Zhang(张婷), Xiangxian Wang(王向贤), and Zao Yi(易早). Efficient manipulation of terahertz waves by multi-bit coding metasurfaces and further applications of such metasurfaces[J]. Chin. Phys. B, 2021, 30(2): 24211-0.

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Efficient manipulation of terahertz waves by multi-bit coding metasurfaces and further applications of such metasurfaces

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